Back before 1974 it seems Mustangs had so many more options then today, you had a big choice of engines: 429's, 351'sC, HO, CJ, 4bbl, 2bbl, 302's, I6's, 390's, 428's, 289's...Sometimes 5 or 6 a year to choose from. 4 different trannies, whole bunch of rear end ratio's. Now you have a choice of...